I will give you the glory since this is literally the most elaborate FFmpeg and MKV manipulation I have ever done, so it was a learning process.įirst, I used mkvmerge to identify which tracks are which in my_movie.mkv: mkvmerge -identify my_movie.mkv That said, all of the steps I outline below worked for me, but if anyone knows a cleaner way to do this in one command, please feel free to post as an answer. Thus, this discovery and the solution to this mini mess. I discovered this based on Gyan’s comment, I decided I can fix this only by actually breaking out individual mono tracks from the AC3, listening to each, and then reconstructing the AC3 to fix the audio layout. Swapping them results in a properly balanced, normal sounding AC3 file. The “Center” channel was actually “Right” and visa-versa. | + Default duration: 00:00:00.032000000 (31.250 frames/fields per second for a video track)ĭetails of the audio track here using exiftool is: Track Number : 2 | + Track number: 2 (track ID for mkvmerge & mkvextract: 1) What is happening and what can I do to properly downmix this? I hope I can do this in Handbrake, but if not I assume I would have to extract the AC3 out of the MKV, downmix it in some other tool and then toss it back into the MKV?ĭetails of the audio track here using ffmpeg -i: Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s (default) (forced)ĭetails of the audio track here using mkvmerge -identify is: Track ID 0: video (MPEG-4p10/AVC/h.264)ĭetails of the audio track here using mkvinfo is: | + Track But if I set the audio of VLC to “Headphones”… Wow! It becomes a normal stereo downmix. I can play it on VLC (version 3.0.6) on my MacBook Air and I get the same odd sound through my speakers heavy right barely anything left. Just enough sound to not be silent but utterly no music or dialogue or anything is really audible. When I convert it with Handbrake using default “General” settings of seemingly any type-Fast, Very Fast, HQ or Super HQ-the audio downmixing from 5.1 audio results in weird stereo with essentially all of the audio going to the right channel and the left channel seems to have some channel that is just-for lack of a better term-background remnants. So I have successfully used Handbrake (version 1.1.2) to convert many large MKV files into smaller, iOS and macOS compatible video files I can play on my iPhone and MacBook Air for a while without really having any issues until this one specific movie.
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